Digital Signal Processing Mock Test 10

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Question 1 of 10

1. What is the folding frequency for the aliased version of x(n) with sampling rate F?

F/2

F/2D

F/4D

F/D

Question 1 of 10

Question 2 of 10

2. What is the new ideal interpolation formula described after few problems with previous one?

g(t)=\(\frac{sin⁡(6 πt/T)}{(πt/T)}\)

g(t)=\(\frac{sin⁡(3 πt/T)}{(πt/T)}\)

g(t)=\(\frac{sin⁡(2πt/T)}{(πt/T)}\)

g(t)=\(\frac{sin⁡(πt/T)}{(πt/T)}\)

Question 2 of 10

Question 3 of 10

3. What is the term used to describe the range of an A/D converter for uni-polar signals?

FSR

Full-scale region

FSS

Full scale

Question 3 of 10

Question 4 of 10

4. In equation \(x_+ (t)=F^{-1} [2V(F)]*F^{-1} [X(F)]\), if \(F^{-1} [2V(F)]=δ(t)+j/πt\) and \(F^{-1} [X(F)]\) = x(t). Then the value of ẋ(t) is?

\(\frac{1}{π} \int_{-\infty}^\infty \frac{4x(t)}{t-τ} dτ\)

\(\frac{1}{π} \int_{-\infty}^\infty \frac{x(t)}{t-τ} dτ\)

\(\frac{1}{π} \int_{-\infty}^\infty \frac{2x(t)}{t-τ} dτ\)

\(\frac{1}{π} \int_{-\infty}^\infty \frac{x(t)}{t+τ} dτ\)

Question 4 of 10

Question 5 of 10

5. What is the main function of (D/A) or DAC converter?

Converts Digital to Analog Signal

Converts Analog to Digital signal

All of the mentioned

None of the mentioned

Question 5 of 10

Question 6 of 10

6. In the equation x(t) = a(t)cos[2πF_ct+θ(t)], Which of the following relations between a(t) and x(t), θ(t) and x(t) are true?

a(t), θ(t) are called the Phases of x(t)

a(t) is the Envelope of x(t), θ(t) is called the Phase of x(t)

none of the mentioned

a(t) is the Phase of x(t), θ(t) is called the Envelope of x(t)

Question 6 of 10

Question 7 of 10

7. Which of the following is true about the filtering operation on x(n)?

Linear and time invariant

Time variant

None of the mentioned

Linear

Question 7 of 10

Question 8 of 10

8. In time-domain expression, \(x_+ (t)=F^{-1} [2V(F)]*F^{-1} [X(F)]\). The signal x₊(t) is known as

Systematic signal

Both Analytic signal & Pre-envelope of x(t)

Analytic signal

Pre-envelope of x(t)

Question 8 of 10

Question 9 of 10

9. What are the effects produced by Dm by setting up an integrator at the front of DM?

Simplifies the DM decoder

Increases correlation of the signal into the DM input

Emphasizes the low frequencies of x(t)

All of the mentioned

Question 9 of 10

Question 10 of 10

10. The frequency shift can be achieved by multiplying the band pass signal as given in equation
x(t) = \(u_c (t) cos⁡2π F_c t-u_s (t) sin⁡2π F_c t\) by the quadrature carriers cos[2πF_ct] and sin[2πF_ct] and lowpass filtering the products to eliminate the signal components of 2F_c.

True

False

Question 10 of 10